A large, bright arch or loop of solar material suspended in the Sun's corona by magnetic fields, extending thousands of kilometers above the solar surface. These structures can persist for weeks or months before erupting or fading away.
From Latin 'prominentia' meaning 'a jutting out' or 'projection.' The astronomical usage dates to the 19th century when astronomers observing solar eclipses noticed these flame-like projections extending from the Sun's limb, appearing to jut out from the solar surface.
Solar prominences are like magnetic hammocks holding hot plasma that's 10 times denser than the surrounding corona - some are so large they could hold dozens of Earths! When viewed against the Sun's bright disk, these same structures appear as dark filaments, showing us that perspective is everything in astronomy.
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